George williamson



G. WiLUAMSON.

Work Holder.

Patented Nov. 13, 1860,

In We 711 607.- 70 MW" UNITED STATES PATENT OFFICE.

GEORGE WILLIAMSON, OF NEWARK, NEW JERSEY, ASSIGNOR TO L. S. GOBLE AND H.E. RICHARDS, OF SAME PLACE.

CLAMP FOR HOLDING CYLINDERS TO BE POLISHED.

Specification of Letters Patent N 0. 30,660, dated November 13, 1860.

T 0 aZZ wh0m it may concern:

Be it known that I, GEORGE WILLIAMSON, of the city of Newark, in thecounty of Essex and State of New Jersey, have invented a certain new anduseful Improvement in Revolving Center-Blocks Upon IVhich to Sandpaperor Polish the Exterior Surface of Wooden Boxes; and I do hereby declarethat the following is a full, clear, and exact description of the same,reference being had to the accompanying drawings, making a part of thisspecification, in which- Figure 1, is a perspective View, Fig. 2, aperspective view of a part of a wooden box to polish the exterior ofwhich the center block, Fig. 1, is constructed and adapted, and Fig. 3,is a longitudinal section of Fig. 1.

The same letters indicate like parts in all the figures.

A, Figs. 1 and 3, is a block of wood or metal, adapted to be screwedupon the end of an upright shaft which shall project slightly above thetop of a bench or table.

B, Figs. 1 and 3, is one of three staves or sections, fitted asrepresented into the solid part of the block A. These staves or sectionsare partially held in place by the screw 0, but free to move on o, andare further secured by the elastic band (Z, which passes in a groovearound the whole block, as represented in Fig. 1. Underneath each of thesections B, is a spiral spring shown at s, Fig. 3. The sections B, arefree to move in and out from the center at the bottom, and when notinclosed and restrained by the box are held out at the bottom, by meansof the elasticity of the spring 8, and band (i,

substantially as shown in Fig. 3, and when so held out, compose sectionsof a larger circle than the main part of the block A.

The operation is as follows: The block Fig. 1, being set to revolverapidlyand the wooden cylinder Fig. 2, requiring to have its exteriorsand papered or polished, is placed and pressed down upon the revolvingblock Fig. 1. The sections B, will yield to the unequality of thecylinder and accommodate themselves to its size, at the same timegrasping the cylinder, as it were. from within and causing it to revolvewith the block, and while thus revolving it may be sand papered orpolished as required. The red lines in Fig. 1, show the position of thecylinder when on the block. By a sudden and rapid movement of the hands,the cylinder may be taken from the block while revolving and anothersubstituted in its stead all without arresting the revolution of theblock. The flange K, Figs. 1 and 2, of the main block A, prevents thesections B, from springing out farther than required, and said sectionsare cut down as repre sented at the point K, to permit the necessarymovement.

What I claim as my invention and desire to secure by Letters Patent ofthe United States is- The combination of the section B, flange K spring8 screw 0, and band (Z substantially in the manner and for the purposedescribed.

GEORGE WILLIAMSON. Witnesses:

JAMES E. MGBETH, OHARLEs H. BLANCH.

